The Etiology of malocclusion

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King Saud University College of Dentistry

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Presentation transcript:

The Etiology of malocclusion General factors Local factors Skeletal factor Muscle factor Dental factor

Muscle factors affecting occlusal development Dr. Ahmed AL-Mayali B.D.S M.Sc. Ortho. ahmed.almayali@uokufa.edu.iq

Muscle factors affecting occlusal development The lips Vertical plane Sagittal plane

Competent lip Incompetent lip Vertical plane

Incompetent lip Skeletal Soft tissue importance

Sagittal plane Cl II Cl III

Sagittal plane - + Mild Cl II sever Cl II

The lip-line Normal

Low lip line

Not applicable

High lip line

The tongue Tongue size Tongue size = lower jaw Open bite

Tongue posture Lips apart Nasal breathing

Tongue function

Normal swallowing requirement closure of the lips Teeth in light occlusal contact Tongue elevated to the palate Momentary clenching of the teeth as food pass

1-Tooth apart adaptive swallowing

Adaptive swallowing 2-Tooth together adaptive swallowing

3-Swallowing with endogenous tongue thrust

Thank you